Physics - June 2007

my little brother did the experiment about the candle that stops burning if u close on it with some tube ( the candle is standing in a vase of water), after a while the candle stops burning and the water level rises a little. So the oxygen is consumed by the candle but why the water level rises???

2007-06-16 05:28:03 · 4 answers · asked by lallous_metal 1

2007-06-16 05:01:00 · 5 answers · asked by Rawr 2

2007-06-16 04:45:26 · 5 answers · asked by Man of Doubts 2

2007-06-16 04:37:22 · 4 answers · asked by chandu murthysailajavandana 1

2007-06-16 04:24:16 · 19 answers · asked by john b 2

I remembered seeing in CNN about radiation from the microwave killing a person. Is this true? If yes, how?

2007-06-16 03:54:15 · 7 answers · asked by helpinghand 2

Hello, im having great difficulty on this question, ive done A - D but can't do the last 2 E and F, any help/advice or links would be great!

A flywheel has a mass of 225kg and rotates at 3000 revs per minute in a pair of 120mm diameter bearings, with a coefficient of friction of 0.032.
Calculate :
a)The load on each bearing.
b)The frictional force exerted on each bearing
c)The work done per minute in overcoming friction
d)The total power Consumed per minute in overcoming friction.
The flywheel takes 30 seconds to reach the angular velocity stated. Calculate
e) The average angular acceleration
f) The linear distance that a point on the flywheel would travel in that time


A)
F = mg = 225 x 9.81 = 2207.25N
2207.25/2 = 1103.625N

b) = m x mg (m = 0.032)
= 0.032 x 1103.625
= 35.316N

c) Work done = Force x Distance
In one revolution – 35 x πD
= 35.316 x π x 0.12
= 13.31
At 3000rpm = 13.31 x 3000
= 39941.45 n/m

d) Power = 39941.45/60
= 665.6pw

2007-06-16 03:20:59 · 3 answers · asked by MoLeY 1

I am looking for any scientific companies/businesses/industries in and around the Oxford area which I can approach to get work experience at for throughout this summer. Physics based would be most preferred. Does anyone know any without me randomly searching the internet to try and find some?

2007-06-16 02:56:58 · 3 answers · asked by Anonymous

I say yes and my husband says no. He thinks the sand weighs more.

2007-06-16 02:31:16 · 7 answers · asked by crystal lee 5

if there is no such thing as random and everything is predetermined isnt the idea of thought just an illusion?

2007-06-16 02:17:30 · 10 answers · asked by qwerasdfqewr 1

2007-06-16 01:44:14 · 6 answers · asked by vinson_30 1

2007-06-16 01:25:30 · 3 answers · asked by matt_n_will4ever 2

If the human eye could perceive the entire EM spectrum as opposed to just visible light, what would the world look like and would our brains be able to make sense of what we were seeing?

2007-06-15 23:41:57 · 8 answers · asked by maitreyauk 1

2007-06-15 23:02:15 · 5 answers · asked by Anonymous

2007-06-15 22:42:32 · 5 answers · asked by Anonymous

why does the color white more likely to reflect light and heat, and why does the color black more likely to absorb heat?

2007-06-15 22:37:13 · 9 answers · asked by FallenAngelSadako 4

2007-06-15 22:31:55 · 3 answers · asked by ixat02 2

2007-06-15 21:47:57 · 6 answers · asked by oozing uranus 1

most obvious effect of gravity - things falling down - can be eliminated by making the transition to a reference frame that is in free fall, and that in such a reference frame, the laws of physics will be approximately the same as in special relativity.

could this mean that stimulating a past event can bring you the same experience in the past, as if you were experiencing it again?

2007-06-15 21:43:58 · 2 answers · asked by stoove 4

2007-06-15 21:04:06 · 15 answers · asked by Human 573947 2

I know that the Higgs mechanism is intended to confer mass, but general relativity included mass through the stress-energy tensor as a fundamental constituent of the theory.

Any theory that supercedes general relativity has to include all that general relativity had to say it just seems weird that mass seems to be almost an afterthought in current efforts to find a theory of everything.

2007-06-15 20:31:16 · 4 answers · asked by mesun1408 6

2007-06-15 19:43:15 · 12 answers · asked by zhen 1

a particle travels with speed 50m/s from the point (3,-7) in a direction 7i-24j. find its position vector after 3sec.

2007-06-15 19:32:23 · 2 answers · asked by Swathi M 1

I have crumple zone but is there any more?

2007-06-15 19:20:29 · 4 answers · asked by Orpheus Muse 1

Would the chimney function similarly to a window? Would convection occur in such a narrow space? Would the standing air column limit effectiveness of heat exchange?

2007-06-15 19:11:06 · 7 answers · asked by jueyanz 3

2007-06-15 17:57:55 · 8 answers · asked by Anonymous

whereas after a good rain when humidity is actually very high people seldom say that a humid day...yes it is correct that high temperature causes greater evaporation and that vapour increases humidity content of the local atmosphere ...but from my standpoint degree of humidity in this case will never be greater than the degree of humidity after a heavy rain .
please refrain from doing non-scientific answers . And please answer !

2007-06-15 17:42:44 · 6 answers · asked by shikha m 1

if so how does it work?

2007-06-15 17:17:35 · 3 answers · asked by Anonymous

An 84-ohm resistor has a current of 0.62 A and is connected in series with a 130-ohm resistor. What is the emf of the battery to which the resistors are connected?

The answer is 130 V, but what is the solution? Coz I always get something like 133.6.

2007-06-15 17:09:52 · 3 answers · asked by plca 1

http://s24.photobucket.com/albums/c42/seriousreefer911/?action=view¤t=PhysicsProblem1.jpg

Here, the current flowing through the 8.45 ohms ressitor is 1.22 A.

What is the voltage through the battery?

I got 10.306 and the book says that the answer should be 103.6.

What is constant in this type of problem, the current or the voltage?

2007-06-15 17:04:59 · 4 answers · asked by plca 1